Siegfried hammacher



UNITED STATES PATENT OFFICE."

SIEGFRIED HAMMACHER, or BERLIN, GERMANY AcTwfE MASS FORELE-CTRIC'ACCUMULATORS.

er-ncrmca'rrou forming part of Letters rattle No. 578,870, ems March 10,1897. Application not June 27, m5. sum No. 564,280. (No astime 1'0allwhom it may concern:

Be it known that I, SIEGF'RIED IIAMMAQHER, manufacturer, of 32Andreasstrasse, Berlin, Kingdom of Prussia, German Empire, have inventednew and useful Improvements in an Active Mass for Electric,Accumulat'ors,

' of which the following is a specification;-

The said invention consistsin manufacturing the active mass of electricaccumulators by means of chemical reaction, so as to transform theoriginally incoherent mass into aporou's, but also coherent, body forthe purpose of obtaining a greater electromotive force than yieldedthrough the application of ordinary lead oxids.

Experiments have shown that the oxids of lead, such as minium orlitharge, when applied in excess and brought together with the bodies ofthe phenolgroup of the formula,

OnHn-,OH in watery solution are transformed into bodies characterized asbasic phenylates. The process of making said active material consistseither in the direct formation of thephenylates from the oxids of leadby mixing the oxide with thewa-tery so- 25 lutions of the phenol bodiesand then drying or in mixing the basic phenylates, which may be formedseparately, with the oxids of lead with or without the assistance of asolvent for the phenylates. The dry mass may then be 3 formed in theordinary manner in-dilute acid. Having now described my invention, what.I claim, and desire to secure by Letters Patent, is- An active mass forelectric accumulators, 35 consisting of basic phenylates of lead mixedwith the oxids of lead, as and for the purpose set forth. In witnesswhereof I have hereunto signed my name in the presence of twosubscribing 40 witnesses.

SIEGFRIED HAMMACHER.

Witnesses WILLIG ECKER'I, OSCAR MICHAELIS.

